Yes, trademark typo domains do make money...

...but you are risking a lot.

Some companies will rightly go after you in the courts if you infringe their trademark with a domain name, and yes, it IS trademark infringement even if you misspell the trademark.

For example, Miicrosoft.com would be a trademark typo that Microsoft would haul your ass into court over. Saying "Oh I didn't know typos could infringe trademarks Mr. Gates, please put that shaft down" will not protect you.

Legal fees alone could leave you without a paddle. Why take on all that risk for some low $ parking income you made from that once-clever-but-not-so-wise-now trademark typo? My advice: don't do it.